Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1755fbd0ebde228…

MALICIOUS

PDF

85.5 KB Created: 2021-08-16 01:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7baea275695c022ac2f7dd067e6f1e68 SHA-1: ecf639afc4166b0e51edf264e926840cbdb80c73 SHA-256: d1755fbd0ebde22829f0e53ea0fcd5aa32ec0d7d8712c9497a8aac15682730a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the malicious intent of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=bodyweight+exercises+pdf PDF link annotation
    • http://logiccpacma.com/ckfinder/userfiles/files/fopugasexiwi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b202d77dd61---27309210385.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/roronibefigono.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/rj1s8ed04elq6tk6vgfeehavid/mapifazuvi.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/sunipavamumokobonezodeju.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/49865611167.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e20ffa9de43---40496595258.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g2hp8le6vcgi8nptj8o8oqrsl6/39575275930.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/78024575558.pdfIn PDF document text
    • http://usmleworkout.com/files/file/vedegigajofiwi.pdfIn PDF document text
    • http://dalaichau.com/files/8168376963.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/27934797072.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/fegapuzowoxijifatapa.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/48047972639.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16109b9b2862c3---zizuwitenakazobevut.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b588eb825e801412850ffa3903ebca7e/12270034972.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/58024842873.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/bupenefinolanepixit.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae19c7c1f---30668606820.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210801202930.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/70454147864.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/3f6479d17251ccdc6d89df72bd55fe95/vafuzujafufipis.pdfIn PDF document text
    • http://getvisa.ru/images/File/sujironegaxeroxuga.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/70214482673.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fe65cbc60---90231888911.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/kiwibatawomojan.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/q96c8jbkr9oqjkof1b2rb5dv67/51108235535.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16432 bytes
SHA-256: c2fe223a0aa7489e30d4a78e2bc9721a778d7de5b68f491bc0af19f223d42e80
font_01_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 10944 bytes
SHA-256: d843e0f035279ffd0183664b51374fc4694b5b0b41bdedf4645efb3ee9fede9a
font_02_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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